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btw the apk is an archive format so you can just decompress it using your favorite archive manager of choice (7zip, winrar, etc)
all of the image files are on res/drawable-(dpi) and the sound effects are on assets/se/effect. there's also some layouting stuff on xml which might or might not be useful depending on what you're trying to do, but worst case scenario you can literally just recreate the ui as an audacious/winamp skin or whatever
i have a feeling mr. masuda won't be happy about this